Table 4.

Odds ratios and 95% confidence intervals for the association between GWG and autism in different maternal pre-pregnancy BMI categories

	OR	95% CI	p
Underweighta
Inadequate weight gain	1.164	0.726–1.866	0.530
Excessive weight gain	1.016	0.502–2.055	0.965
Normala
Inadequate weight gain	0.784	0.609–1.010	0.059
Excessive weight gain	1.289	0.947–1.754	0.107
Overweight/Obesea
Inadequate weight gain	0.548	0.193–1.559	0.260
Excessive weight gain	2.468	1.102–5.526	0.028

BMI body mass index, GWG gestation weight gain

Child’s gender, child age, parental age, and family annual income were used as covariates

^aAdequate weight gain group was used as a reference